﻿// Copyright (c)  YISH. All rights reserved.
// Licensed under the MIT License, See License.txt in the project root for license information.

using NSQL.Sharpen;

namespace NSQL.Expressions.Functions
{
    public class ExtractFunction : BaseExpression, IExtractFunction
    {
        public IExpression DateTime { get; set; }
        public ExtractType Type { get; set; }

        public ExtractFunction(IExpression dateTime, ExtractType extractType)
        {
            DateTime = dateTime;
            Type = extractType;
        }
        
        public override T Accept<T>(IExpressionVisitor<T> visitor) => visitor.Visit(this);
        public override void Accept(IExpressionVisitor visitor) => visitor.Visit(this);
        public override bool IsValid => DateTime.IsValid;
        protected override IExpression DeepCopy()
        {
            return new ExtractFunction(DateTime.DeepClone(), Type)
            {
                Tag = Tag
            };
        }
    }
}